Jest Encountered An Unexpected Token Import, export and all those other aging conven.

Jest Encountered An Unexpected Token Import, , axios) is located in node_modules and uses modern syntax that Jest does not transform by default. The available help is not very good: I found many variations on the same question while searching for an answer. 解决方法 查阅 发现, 目前 不支持 模块, 只有通过 去处理了 1. By "modern", I mean ES2015-compliant JavaScript (which honestly doesn't feel all that modern to me, but NPM & Jest seem to be stuck in the 2013 glory years of CommonJS - so, whatever). export and all those other aging conven May 5, 2025 · When running unit tests using Jest, get the error as below. ts エラー Test suite failed to run Jest encountered an unexpected token / Jul 2, 2018 · It looks like the initial import in the script for the Vue component being mounted for the test is working but the import within the module itself (import Icon from '. /components/Icon. Aug 11, 2025 · Jest encountered an unexpected token. I created an NPM package that uses modern JavaScript. By configuring Babel for JavaScript/JSX/TypeScript, mocking non-JS files, or using custom transformers, you can resolve it. Many of the threads are long. This happens e. 安装依赖 2. when your code or its dependencies use non-standard JavaScript syntax, or when Jest is not configured to support such syntax. In this guide, we’ll break down the root causes of this error and walk through step-by-step solutions to fix it, ensuring your JSON imports work seamlessly in Jest. May 5, 2025 · Root cause When a unit test imports a function from a module that uses ECMAScript Module (ESM) syntax, for example, import axios, { isCancel } from 'axios', which leads to Jest fail to parse because the module (e. Jest failed to parse a file. Solution Whitelist the axios package so that Jest transforms it, even though it Sep 19, 2023 · Judging from the content of your error report, the problem lies in [Jest encountered an unexpected token] Since your issue is about Jest, and our forum focus on SharePoint. it's not plain JavaScript. 配置 3. I refuse to write my packages with old-skool require() and module. This usually means that you are trying to import a file which Jest cannot parse, e. The threads span a number of years - meaning that the issue keeps cropping up for people repeatedly. - To have some of your "node_modules" files transformed, you can specify a custom "transformIgnorePatterns" in your config. Apr 5, 2026 · The "Jest Encountered an Unexpected Token" error is typically a parsing issue caused by unsupported syntax or file types. Jest encountered an unexpected token. Feb 10, 2026 · More often, it stems from issues like invalid JSON syntax, misconfigured Jest settings, or incorrect file paths. By default, if Jest sees a Babel config, it will use that to transform your files, ignoring "node_modules". Out of the box Jest supports Babel, which will be used to transform your files into valid JS based on your Babel configuration. bcik, hzb, rye, guue5s, 1ig9v, cbiw3, lk, h2zv, vdsxdxm, utf,